forced accidentals

[Mark Polesky]

Two questions...

1.) I found this property in the accidental-interface page in the docs:

    forced (boolean)
        Manually forced accidental.

    I tried to make it work, but I couldn't get it to do anything.
    Can anyone explain how this property is used? 
        
(see 
http://lilypond.org/doc/v2.11/Documentation/user/lilypond-internals/accidental_002dinterface
 )


2.) I'm working on a project where I'd like to be able to take a music 
    expression that contains manually forced accidentals (eg. "c!") and write 
    some command at the beginning that would ignore all of them, like this:

    {
      \ignoreForcedAccidentals
      c d e! f
    }

    It's also essential that such a command does NOT remove accidentals that 
    would've been printed anyway. This depends on the accidental-style, too.
    Is there a way?

Thanks,
Mark